A: Hi Gladys, The tilt sensors are basically switches that turn on when they are tilted. The problem with using them as you are looking to is that they can't tell which way they are being tilted so if you had one on each side they would both turn on regardless of the way you tilted the hat. An Arduino is a little microprocessor that can be programmed to read many inputs and operate several outputs. You can program it with something like "if tilt sensor is tilted turn LEDs 1,2 and 3 on for 5 seconds then LEDs 4,6 and 6" or much more complex things if you have more sensors and outputs.